* {
  list-style: none
  font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', 'Hiragino Sans GB',
  'Microsoft YaHei', '微软雅黑', Arial, sans-serif;
}

/*设置html body 高度*/
html,body {
  margin: 0
  padding: 0
  height:100%
  width: 100%;
  position: relative;
}